#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

//????
main()
{
    const float PI = 3.14159;
    double r;
    printf("Input r:");
    scanf("%lf", &r);
    printf("circumstance = %f\n", 2 * PI * r);
    printf("area = %f\n", PI * r * r);
    printf("circumstance = %lf\n", 2 * PI * r);
    printf("area = %lf\n", PI * r * r);
}